Explain why does conductivity of germanium crystals increase on doping with galium.

Q: 03. How can we determine of the band-gap of gemanium from electrical measurements?

A: Band gap of semiconductor like germanium can be determined by the study of the Variation of its…

Q: estimate the fraction of electrons above fermi level in sodium and copper at room temperature

A:

Q: 2. "A ferrite with fixed composition can exhibit quite different magnetic behavior when prepared…

A: A ferrite with fixed composition can exhibit quite different magnetic behavior when prepared under…

Q: Strontium titanate (SrTiO3) is another wide bandgap semiconductor that has been investigated for use…

A: For H2|H+ electrode the value of standard reduction potential is 0V. For O2|H2O electrode the value…

Q: Determine the lattice constant, a (in nm), of a metal conforming to the BCC structure having an…

A:

Q: What are the uses of Interstitial carbides?

A: The use of interstitial carbides has to be given.

Q: (non-ferromagnesian) silicates with the dark (ferromagnesian) silicates and list three minerals…

A: Silicates can be generally divided into  two  light and dark silicates. the dark silicates are also…

Q: Explain the effect of dispersed phase in determination the properties of osite materials?

A: Effect of the dispersed particles on the composite properties depends on the particles  Large…

Q: Data on a single crystal of NiSO4⋅7H2O give χm = 6.00 × 10−8 m3 mol−1 at 298 K. Identify the…

A:

Q: Provide a general description of how hydrometallurgy is used to extract metals from ores.

A: Extractive metallurgy is the practice of removing valuable metals from an ore and refining the…

Q: What is rock salt? Mention its colour and the reason due to which it has this colour ?

A: Salt is a mineral consisting predominantly of sodium chloride, a chemical element that belongs to a…

Q: Explain why the energetics of dissolution can be different for elements in the same group?

A: Dissolution energy is defined as the amount of energy released when a solute is dissolved in a…

Q: Describe the nature of electrical conduction in (a) germa- nium doped with indium and (b) cadmium…

A: (a) Germanium doped with indium: When germanium is doped with indium, it creates new levels at the…

Q: Why do natural diamonds do not behave as semi-conductors?

A: “Since you have asked multiple questions, we will solve one question for you. If you want any…

Q: (а) Give an example of zone refining of metals. (b) What is the role of cryolite in the metallurgy…

A: Metallurgy is the process which is more concern with the extraction and isolation of metals from its…

Q: what volume of decinormal k2cr2o7 solution would be needed to convert 1.19 g of tin to stannic…

A:

Q: A silicon sample maintained at 300 K is characterized by the energy band diagram in Rg.4-48:…

A: a. Yes the eqilibrium conditions previl because of the fermi level is contant with position.

Q: Direct bandgap semiconductor materials generally support radiative (optoelectronic) transitions…

A: Interpretation-  To interpret why direct bandgap semiconductor materials generally support radiative…

Q: (a) Give an example of zone refining of metals. (b) What is the role of cryolite in the metallurgy…

A: a) Zone refining of metals is the technique by which impurities are extracted from the metals and…

Q: Describe the role of the following :(i) SiO2 in the extraction of copper from copper matte(ii) NaCN…

A: Introduction- Metallurgy is the branch of chemistry that deals with mining of metals and their…

Q: Calculate the planar density for the (110) plane in (bcc) Fe. The lattice parameter for this…

A: In this question we have to calculate the planar density for plane (1,1,0) in bcc. molar mass of Fe…

Q: Describe the composition of Glass electrode used for the pH measurements?

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Q: >Provide a general description of how electrometallurgy is used to extract metals from ores.

A: A technique of extraction of metal from its ore in which electrolysis is used is known as…

Q: 1.6. The E-k relation of phonons of GaAs is shown below. Discuss, preferably in less than 20 words,…

A: Given:  The E-K relation of phonons of Ga- As in the figure.  GaAs is an Direct band gap…

Q: discuss the importace and methods of solid liquid separation processes of hydro metallurgy

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Q: What do the silicate structures include?

A: Silicates are inorganic compounds of silicon ,having oxygen attached with it. Silicates are…

Q: Metal sulfides are often first converted to oxides by roasting in air and then reduced with carbon…

A: Roasting is defined as the process that involves heating of mineral ores (usually sulfides) in…

Q: What is the details programme of the traineeship in mineral processing?

A: details programme of the traineeship in mineral processing:

Q: Why is vanadium present in oil from some sources?

A: Vanadium is an element having atomic number 23. The atomic symbol of vanadium is V. It is a…

Q: rigid, crystal lattice? Calculate the recoil free of 57 Fe atom. energy a (mc2 = 5 x 1010 eV, E, =…

A:

Q: A sample of silicate weighing 0.5000 g is decomposed and subsequently yields a mixture of NaCl and…

A: Given data: Weight of sample of silicate = 0.500g. Weight of mixture of NaCl + KCl =0.1803g. Weight…

Q: SOFC, Proton conducting membrane

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Q: Write a report on the element vanadium (v), where the report includes the properties and…

A:

Q: The standard enthalpy of decomposition of the yellow complex NH3SO2 into NH3 and SO2 is +40 kJ…

A: The decomposition reaction is,                                 NH3SO2   -----> NH3 (g)  + SO2 (g)…

Q: Calculate the theoretical volume change accompanying a polymorphic transformation in a pure metal…

A: Since you have asked multiple questions questions, we will solve the first question for you. If you…

Q: 7. The enthalpy of formation of Frenkel defects (kJ mol) is AgCI, 140, AgBr, 109, AgI, 58. The…

A: Frenkel effect is caused if some of the ions of an ionic compound is missing from its crystal…

Q: 9.) Which of the following statements is correct? a) The carrier concentrations increase with…

A: Semiconductors are materials whose electrical property lies between an insulator and a conductor.…

Q: Knowing that the crystal spacing of the monochromator  [Topaz crystal (303) ] has an interplanar…

A:

Q: If blast furnace slag is activated by NaOH, resulting in the formation of alkali-activated slag…

A: Blast furnace is used in mainly metallurgical processes.  Here the metals undergo smelting process.…

Q: The U.S. Department of Energy has set the benchmark of 6% H by weight for an acceptable hydrogen…

A: given materials : NaAlH4, LiAlH4, LaNi5H6,  TiFeH2

Q: How can you characterize Graphene based nano composites?

A: Graphene is a form of carbon in which the atoms are placed in honeycomb like structures. It has many…

Refining of Crude Metal

Metallurgy could be defined as a technique by which metals can be extracted in their pure nature. Extractive metallurgy directs with the route of eradicating the valuable metals from ores and purifying the extracted metals to pure nature. In hydrometallurgy, the metal extraction’s from their ores is done using an aqueous solution. In the pyrometallurgical process, high temperatures are employed to initiate the reactions between gases, molten metals, and solids. In electrometallurgy, the technique is carried in an electrolytic cell.